3.4 soft mod device inserted in sd slot cannot be used?

hey, this is the first time ive tried to softmod a wii its on the 3.4e update, i am following Dogeggs, New 3.1-4.1 Softmod for ANY Wii guide. i have downloaded the files needed and put them onto my FAT32 formatted sd card but everytime i put my sd card into my wii, it just says the device inserted into the sd slot cannot be used. i have tried 3 different sd cards, one sandisk, one kingston and one transcend one but still no luck, anyone have any ideas of what i can try doing?
Thanks